253403561 has 2 divisors, whose sum is σ = 253403562. Its totient is φ = 253403560.

The previous prime is 253403509. The next prime is 253403567. The reversal of 253403561 is 165304352.

253403561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129504400 + 123899161 = 11380^2 + 11131^2 .

It is a cyclic number.

It is not a de Polignac number, because 253403561 - 2¹⁸ = 253141417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (253403567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126701780 + 126701781.

It is an arithmetic number, because the mean of its divisors is an integer number (126701781).

Almost surely, 2^253403561 is an apocalyptic number.

It is an amenable number.

253403561 is a deficient number, since it is larger than the sum of its proper divisors (1).

253403561 is an equidigital number, since it uses as much as digits as its factorization.

253403561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 253403561 is about 15918.6544971615. The cubic root of 253403561 is about 632.8064607676.

The spelling of 253403561 in words is "two hundred fifty-three million, four hundred three thousand, five hundred sixty-one".